• NetFlow is configured to capture flows to the NetFlow cache, • NetFlow export is configured to send flows to the collector, • The NetFlow cache is searched for flows that have terminated and these are exported to the NetFlow collector server, • Approximately 30 to 50 flows are bundled together and typically transported in UDP format to the NetFlow collector server, • The NetFlow collector software creates real-time or historical reports from the data. Roland Dobbins, Cisco IT Network Engineer. NetFlowとは NetFlow（ ネットフロー ）とは、ネットワーク上で流れるトラフィックフローを受動的にモニタできる機能 のことです。NetFlowはIOSの機能の1つであり、1996年にCiscoが開発しました。パケットスイッチングは We have found, for example, that many administrators use Wireshark in addition to PRTG. 2. The version or format of the NetFlow export packet is chosen and then the destination IP address of the export server. The following is the configurations for NetFlow on the MSFC for software based flows. In order to carry out such an analysis, you'll configure your routers such that flow packets are sent to a computer with a PRTG probe. It gives you an important first look, e.g. How to Access the Data Produced by NetFlow? (Refer to http://www.iana.org, Protocol Assignment Number Services, for the latest RFC values.). And can be used as a professional NetFlow Analyzer software, as well. Security, capacity planning and traffic analysis including application and user monitoring? NetFlow will help reduce costs by giving you an audit trail, reduce troubleshooting time and facilitate reports to understand network utilization. NetFlow Analyzer PRTG: Setup in 3 simple steps! Standard time output (hh:mm:ss) since the clear ip flow stats privileged EXEC command was executed. More Information on the Cisco Catalyst 6500 Series Switch NetFlow Configuration can be viewed at: The following is an example of how to visualize the NetFlow data using the CLI. i NetFlow is a protocol for collecting, aggregating and recording traffic flow data in a network. More on Packet Sniffing with PRTG. Both monitoring and the NetFlow traffic analysis of physical (Cisco) devices are operational here. In this article, you'll find additional tips on the configuration of Cisco routers. The 9997 is the UDP port the server will use to receive the UDP export from the Cisco device. A compatible sensor must be used for traffic analysis and bandwidth monitoring via NetFlow in PRTG. Number of seconds from the first packet to the last packet of an expired flow divided by the number of total flows for this protocol for this summary period. There are a large number of NetFlow collectors including Cisco, freeware and third party commercial vendors' products that report and utilize NetFlow data. NetFlow data provide a more granular view of how bandwidth and network traffic are being used than other monitoring solutions, such as SNMP. Number of times the NetFlow code looked at the cache to cause entries to expire (used by Cisco for diagnostics only). Wireshark, on the other hand, offers a detailed look at individual data packets. Ip flow ingress is available in Cisco IOS Software Release 12.2(15)T or above. NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. Meets all needs and requirements, This is a must have solution if you are needing any form of monitoring.”, “The tool excels at its primary focus of being a unified infrastructure management and network monitoring service.”. Markus Puke, Network Administrator, Schüchtermann Klinik, Germany. the traffic of a switch port, the CPU load of a server, the free space of a disk drive. Enterprises depend heavily on Cisco IOS NetFlow in order to meet their business objectives including Cisco IT: "As converged networks and IP telephony become more prevalent, the ability to characterize traffic on the network, both for capacity planning and anomaly detection, will become even more critical." For example, an FTP download that lasts longer than the active timer may be broken into multiple flows and the collector can combine these flows showing total ftp traffic to a server at a specific time of day. Enter a value for the Active Flow Timeout which is at least one minute longer than that of the device. Example of CS-Mars Cisco product that utilizes NetFlow to understand security incidents, Appendix A: Software Platform Configuration, 1. All rights reserved. Flexible licensing: Limited: Advanced reporting on all vendor-specific exporters: Full stitching and deduplication: 3rd-party integration (e.g. Configure the router's NetFlow protocol so it sends NetFlow packets to the computer running the PRTG Network Monitor: Alternative: If you do not require long-term traffic analyses for every single PC and would only like to monitor the network traffic occurring presently and recently on the basis of IP or protocol, then creating a NetFlow sensor and correspondingly analyzing the data traffic in the Toplists based on IP or protocol is sufficient. Network Top Talkers does require some configuration. For detailed technical IOS documentation on NetFlow, go to: The following is an example of a basic router configuration for NetFlow. Free trial version: Take the time to explore PRTG so you can determine if it satisfies your needs and meets your expectations.

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